The economic implications of rasburicase treatment in adult tumor lysis syndrome patients

Abstract

e17503 Background: Rasburicase is a recombinant urate-oxidase enzyme used to reduce high levels of plasma uric acid (UA) resulting from tumor lysis syndrome (TLS). Rasburicase reduces UA levels within 4 hours of administration, minimizing risk of serious complications from TLS. Treatment pattern analyses indicate rasburicase is often used in combination with allopurinol; however, no studies have evaluated clinical and economic consequences of this pattern of care. The purpose of the study was to compare hospitalization costs, length of stay (LOS), and duration of critical care in patients receiving rasburicase with or without allopurinol. Methods: Patients in the Premier hospital database administered rasburicase or combination therapy within 2 days of hospital admission were eligible for study inclusion. Patients were excluded if they were <18 years of age or received hemodialysis on admission. Patients were propensity score matched to rasburicase patients based on gender, race, hospital type, provider type, payer type, admission source, use of electrolyte modification therapy, critical care admission, and comorbid diagnoses. Differences in health care costs, LOS, and duration of subsequent critical care were assessed using exponentially distributed generalized linear models with a log link function. Projection weights are used to produce national projected patient counts. Results: There were 280 rasburicase and 310 combination patients matched in the analysis. Mean age of the sample was 65.2, with 31% being female. There were no statistical differences in matched covariates across the cohorts. Rasburicase patients incurred an average total cost of $39,474 per hospitalization compared to $52,047 for combination patients (p = 0.0029). Rasburicase patients also had a lower LOS (10.5 days) compared to combination therapy (16.4 days, p < 0.0001). Duration of critical care was similar in both cohorts (rasburicase = 1.4 days vs 1.8 days, p = 0.1222). Conclusions: Combination therapy of rasburicase and allopurinol resulted in higher total hospitalization costs and longer LOS compared to rasburicase monotherapy. [Table: see text]